Mike Waltz has been dropped as US national security advisor. It's the first big shift in personnel of Donald Trump's second term. Weeks ago, Waltz added a journalist to a chat group of senior officials sharing secret information. Is that why he's being moved - or is there more going on? In this episode:  John Halterwanger, reporter at Foreign Policy Magazine covering U.S. national security Amy Koch, a Republican political strategist Matthew Bryza, a former U.S. diplomat and National Security Council official at the White House Host: Nick Clark Connect with us:@AJEPodcasts on Twitter, Instagram, Facebook